relax SVN archive

TagTable.create_tag_table() now handles single element data.

This allows the single element data to be submitted simultaneously with list data.

Created the bmrb_write_software() function for dumping the software info into the BMRB file.

All attributes (even those of None) are being stored.

Import fix from the previous module deletion.

Removed the kludgy bmrb_saveframes module and shifted the code into exp_info.

Shifted the software() and software_select() functions into their own module, 'generic_fns.exp_info'.

Created the bmrb.software() user function for manually specifying the software used.

Updated the __all__ package lists.

Added the software task to the software containers.

More info is now being placed into the software containers of the experimental info container.